Manhole base section for sewer lines

ABSTRACT

A manhole base section for sewer lines having reinforcing sections on the inside of the base section at opposite ends of the flow channel. Each reinforcing section is of substantial thickness, but the outer side conforms to the outer side of the base section. In each reinforcing section is an inwardly tapered hole aligned with the channel. The sewer pipe for each tapered hole has on its inner end an elastomeric band equipped with tongue-like resilient flexible flanges, which, when crowded into a tapered hole, provide a fluid-tight seal and enable deflection or tilting of the sewer pipe to a limited extent in any direction.

llnited States. Patent [191.

Williams 1 MANHOLE BASE SECTION FOR SEWER LINES [76] Inventor: RichardL. Williarns, Rt. No. 1,

l-larrod, Ohio 45850 [22] Filed: Aug. 3, 1972 [21] Appl. No.: 277,558

[52] US. Cl 285/189, 285/231, 52/21 [51] llnt. Cl. F161 39/04 [58] Fieldof Search... 285/189, 231, 234; 137/363; 52/19, 20, 21

[56] References Cited UNITED STATES PATENTS 3,212,519 10/1965Paschen.... 137/363 2,265,615 12/1941 Stalter 285/231 2,999,699 9/1961Lafferti.. 285/230 821,675 5/1906 Shaw 52/20 2,451,070 10/1948Chamberlain 285/231 Jan. 22, 1974 3/1936 Nathan 285/231 3,348,85010/1967 Scales 285/230 Primary Examiner-Reinaldo P. Machado I fiemen/182M105Eirm: @s9lm Fraselr [5 7 ABSTRACT A manhole base section forsewer lines having reinforcing sections on the inside of the basesection at opposite ends of the flow channel. Each reinforcing sectionis of substantial thickness, but the outer side conforms to the outerside of the base section. in each reinforcing section is an inwardlytapered hole aligned with the channel. The sewer pipe for each taperedhole has on its inner end an elastomeric band equipped with tongue-likeresilient flexible flanges, which, when crowded into a tapered hole,provide a fluid-tight seal and enable deflection or tilting of the sewerpipe to a limited extent in any direction.

1 Claim, 5 Drawing Figures PATENTEDJANZZIQM I 3.787. 078

SHEET 1 Bf 2 MANHOLE BASE SECTION FOR SEWER LINES SUMMARY OF THEINVENTION BRIEF DESCRIPTION OF THE DRAWINGS FIG. I is a top perspectiveview of a manhole base section for sewer lines, showipg sewer pipes inposition,

FIG. 2 is a fragmentary enlarged sectional view of the base sectionshowing a reinforcing section with a sewer pipe mounted therein;

FIG. 3 is an enlarged fragmentary sectional view showing the taperedhole in the reinforcing section and the elastomeric sealing ring;

FIG. 4 is an enlarged sectional view of a sealing ring, the contour ofwhich is cylindrical and of the same diameter throughout its length; and

FIG. 5 is an elarged sectional view of an alternat form of sealing ring,the contour of which is tapered similar to that of the holes in thereinforcing section of the manhole base section.

PREFERRED EMBODIMENT OF THE INVENTION Referring to the drawings, thereis shown a manhole sewer base section M which is usually of concrete andhas a substantial wall thickness. It consists, as shown, of a tubularside wall form 10, which, as shown, is cylindrical, both on the insideand outside and is provided with an integral flat imperforate bottomwall 11. Extending diametrically across the bottom wall on the inside isa relatively shallow U-shaped curved channel 12 establishing the flowline for sewage through the base section. If desired, the upper edgeportion of the side wall form may be stepped for the reception andmounting of a superposed'tubular section, this being well being wellknown in the art and not illustrated on the drawings.

At opposite sides of the sewer base section M, and in alignment with theends of the flow line channel 12, are cylindrical passages or ducts forthe reception of sewer pipes S which establish the sewer line, theinside diameter of these pipes aligning with the channel 12 to afford afree uninterrupted flow. Ordinarily, the sewer pipes S are also concreteand are plain ended, but they may, if desired, be of polyvinyl chloride,vitrefied clay or the like.

In practice, a relatively large hole is made in the opposite sides ofthe tubular side wall form 10 at the ends respectively of the channel12. Fitting this hole and also formed of concrete or the like is areinforcing section 13. The section 13 is cast on the inside of the basesection M and extends from the floor or bottom wall 11 nearlythree-fourths of the depth of the side wall form 10. At the top of thesection 13 is a flat shelf I4 and the inner wall 15 is flat andchord-like in appearance. The reinforcing section extends uniformly onopposite sides of the channel 12 for a substantial distance to afford arelatively thick and sturdy reinforcement. The outer side of the sectionI3, as indicated on FIG. 2, mergers into the outer side of the tubularform 10 and conforms to the shape and contour thereof.

Extending through each reinforcing section I3 is a passage or duct 16which leads to the adjacent end of the channel 12 and is alignedtherewith. The inner end of such passage 16 leads to the channel 12 andthe wall of the passage at this location is spaced from the channel 12approximately the thickness of the sewer pipe S which is intended forsame. As best shown on FIGS. 2 and 3, the duct 16 tapers inwardly fromthe outer end, the degree of taper being not critical, but is such as toenable limited tilting or deflecting of the respective sewer pipe S inany direction. This obviates the necessity of the two sewer pipes Sbeing precisely in alignment with each other and compensates forirregularities in ground conditions and the like.

It is important that an effective liquid-tight seal be secured betweeneach sewer pipe and the walls of the respective tapered passage 16. Forthis purpose, an elastomeric sealing ring or band 17 of rubber of thelike snugly fits around the end portion of each sewer pipe S. It shouldbe closer to the end of the pipe, but its exact location is not criticaldue to the fact that'the passage 16 is a tapered one. The ring or band17, as shown in FIG. 4, consists of a body portion from which radiateoutwardly a plurality of tapered tongue-like flanges,

which are of uniform diameter. When each sewer pipe S, equipped with aband 17, is crowded into the tapered passage 16, the flanges deflectintimately to engage the walls of the passage and provide the desiredseal, even though the pipe is slightly tilted in one direction oranother.

Instead of the band 17 being of uniform diameter throughout, the band17a, shown on FIG. 5, has the tongue-like flanges of tapered form, thatis the outside contour of the band is tapered in conformity generallywith the taper of the passage 16.

From the above description, ,it will be manifest that the reinforcingsections 13 not only add substantial strength and body to the basesection, but also make possible tapered passage or ducts for the sewerpipes S.

These ducts are of substantial length and are tapered so as to enablethe sewer pipes to be tilted or deflected in any desired direction to alimited extent. The elastomeric band or ring affords an efflctiveliquid-tight seal between the parts. A particularly desirable feature ofthe assembly is its simplicity, reducing the cost to a minimum, andenabling installation readily and easily.

By the use of the reinforcing section, larger diameter sewer pipes S canbe used with smaller diameter base sections. This is because thereinforcing section affords greater area to afford the sewer pipereceiving passage than the curvature of the basesection would ordinarilyafford. I

Another important advantage of the reinforcing section 13 as abovedescribed, is that initially the base section may be cast leaving holeson opposite sides to receive the sections 13. Then, when one or morebase sections are required on the job, the reinforcing sections 13 arethen added with tapered holes 16 of the proper size for the intendedsewer pipe S. It will be understood that sewer pipes S vary from 8 to 24inches in diameter, depending upon the demand of service.

What l claim is: l. A manhole base section for sewer lines comprising incombination a tubular form of concrete or the like having a side wall ofgenerally uniform thickness and an imperforate flat bottom wall providedwith a U-shaped flow channel for guiding effluent therethrough, anintegral reinforcing section of concrete or the like adjacent saidbottom wall and at each end of said channel of substantial thickness andextending chord-like across the interior of said tubular form onopposite sides of the respective channel end and outwards toward theopen end of said form for greatly enlarging the thickness of said formin the area of each reinforcing section, the outer side of eachreinforcing section conforming to the outer side of the tubular formthereby to provide a relatively smooth exterior for said form, therebeing a lateral passage through each reinforcing section open on theouter end and tapering inwardly to an opening on the innerend of a sizeapproximately equal to the outside diameter of the sewer pipe intendedto connect in the respective reinforcing section, the wall at the innerend of each passage being spaced from said channel approximately thethickness of the sewer pipe intended for same, thereby to provide anuninterrupted connection,

a plain end sewer pipe of concrete or the like for connection in each ofthe tapered passages of said reinforcing sections,

an elastomeric band snugly fitting the inner end portion of each sewerpipe, and

means on said band adapted when crowded into one of said taperedpassages to provide a liquid-tight seal between the sewer pipe and therespective tapered passage and to afford limited tilting of the sewerpipe in any direction with respect to said tubular form.

1. A maNhole base section for sewer lines comprising in combination atubular form of concrete or the like having a side wall of generallyuniform thickness and an imperforate flat bottom wall provided with aU-shaped flow channel for guiding effluent therethrough, an integralreinforcing section of concrete or the like adjacent said bottom walland at each end of said channel of substantial thickness and extendingchord-like across the interior of said tubular form on opposite sides ofthe respective channel end and outwards toward the open end of said formfor greatly enlarging the thickness of said form in the area of eachreinforcing section, the outer side of each reinforcing sectionconforming to the outer side of the tubular form thereby to provide arelatively smooth exterior for said form, there being a lateral passagethrough each reinforcing section open on the outer end and taperinginwardly to an opening on the inner end of a size approximately equal tothe outside diameter of the sewer pipe intended to connect in therespective reinforcing section, the wall at the inner end of eachpassage being spaced from said channel approximately the thickness ofthe sewer pipe intended for same, thereby to provide an uninterruptedconnection, a plain end sewer pipe of concrete or the like forconnection in each of the tapered passages of said reinforcing sections,an elastomeric band snugly fitting the inner end portion of each sewerpipe, and means on said band adapted when crowded into one of saidtapered passages to provide a liquid-tight seal between the sewer pipeand the respective tapered passage and to afford limited tilting of thesewer pipe in any direction with respect to said tubular form.